Phonograph



PHONOGRAPH.

T. A. EDISON.

(No Model.)

awe/M300 $513 4 abhor/14 4 THE NORRIS FEVERS cu, wuToumu. wAsHmcron. n.c.

UNITED STATES PATENT OFFICE.

THOMAS A. EDISON, OF LLEWELLYN PARK, NEW JERSEY.

PHONOGRAPIH.

SPECIFICATION forming part of Letters Patent No. 500,282, dated June 27,1893.

' Application filed December 3, 1890- Serial No. 373,412. (No model.)

To all whom it may concern:

Be it known that I, THoMAs ALVA EDISON, a citizen of the United States,residing at Llewellyn Park, in the county of Essex and State of NewJersey, have invented a certain new and usefulImprovementinPhonographs,(Case No. 896,) of which the following is a specification.

The present invention relates to means for forming an operativeconnection between a phonograph diaphragm and a recorder or reproducer,which connection shall effectively transmit the vibrations due to soundwaves or the sound record, but shall allow a movement of the recorder orreproducer independent of the diaphragm under the influence of largerirregularities or eccentricities due to imperfection of the phonogramblank or recording surface.

In the accompanying drawings, which illustrate the invention, Figure 1shows a view partially in section of one form of recorder, and Fig. 2shows a similar view of a modified form of recorder.

1 is the phonograph shaft, 2 the phonograph cylinder, and 3 aphonogramblank.

4 is the usual mouth piece, or tube to which the mouth piece may beconnected, below which is a diaphragm 5. At the center of the diaphragmis a magnetic piece or member 6 cemented to or forming a part of thediaphragm. Below this magnetic piece is a second corresponding member 7,supported on or forming a part of the pivoted recorder arm 8. This armmay be magnetized by means of a coil 9 in circuit with battery 10, or inany other convenient manner. In this form I prefer to connect the pieces6, 7 by a light spring 11 to supplement the magnetic connection.

In Fig. 2 is shown attached at the center of the diaphragm a coil orsolenoid 12, and to the pivoted recorder arm is connected a magneticcore 13.

In the drawings the means for turning the phonogram blank and forfeeding the recorder or reproducer lengthwise of the phonogram blank arenot shown since they may be of well known construction and are notspecifically claimed herein.

The connection described between the recorder or reproducer and thediaphragm is found to faithfully transmit the vibrations due to soundfrom the diaphragm to therecorder, or in reproducing from the reproducerto the diaphragm, but when said recorder or reproducer is moved moreslowly by irregularities or eccentricities of the phonogram blank themagnetic connection yields so that the recorder or reproducer movesindependently of the diaphragm. Hence the record or the reproduction issubstantially independent of such irregularities.

' Having thus described my invention, what I claim is 1. The combinationof a phonograph diaphragm or vibrating body, a recorder or reproducer,the diaphragm and recorder or reproducer being connected magnetically,substantially as described.

2. The combination of a phonograph d aphragm, a recorder or reproducer,the diaphragm and recorder or reproducer being slightly separated butconnected magnetically, substantially as described.

3. The combination of a phonograph diaphragm, a magnetic member thereon,a recorder or reproducer and a magnetic member thereon, and in operativerelation to the first member, substantially as described.

4. The combination of a phonograph diaphragm having a magnetic member,and a recorder and a reproducer having a magnetic arm, substantially asdescribed.

5. The combination of a phonograph diaphragm, a magnetic member at ornear 1ts center, a recorder, a magnetic piece connected thereto, and aspring connecting said diaphragm and recorder, substantially asdescribed.

6. The combination of a phonograph diaphragm, a magnetic portion at ornear 1ts center, a recorder having amagnetic arm and means formagnetizing it, and a spring con- .necting said diaphragm and magneticpiece,

substantially as described.

This specification signed and witnessed this 1st day of December, 1890.

THOS. A. EDISON.

Witnesses: A

JOHN F. RANDOLPH, W. PELZER.

